Flush Mount

CT II (Verney-Carron) choke tubes are not interchangeable with any other choke tubes, these choke tubes are approximately 2.1" long.  These chokes are used in all currently produced Hastings wadlock barrels.  Chokes tubes are listed below in order of the most open to the most tight:

Cylinder (7.25" Diameter)
Skeet 1 (.720" Diameter)
Improved Cylinder (.715" Diameter)
Skeet 2 (Light Modified) (.710" Diameter)
Modified (.705" Diameter)
Improved Modified (.700" Diameter)
Full (.690" Diameter)
Extra Full (.682" Diameter)

Safety Warning:
Unload firearm before changing choke tube. Never fire the gun without having the choke tube properly installed in the barrel.
Make sure choke tube is tight.  All chokes should be firmly tightened with an appropriate wrench.
Read your gun’s manufacturers instruction book for safe operation. 
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